Asteroids is a port of an old arcade game. The goal is to shoot down asteroids using your ship, while avoiding getting hit. Aliens will also appear when a level is almost complete, and they will try to shoot you down.

Controls

For every 1000 points earned, you gain an extra life

Press the home button to shoot

Press the power button to exit

Touch the screen to move the ship (if you touch near the top-right, the ship will go towards the top right)

Application development for the ZEN is pretty dead right now, so I don't recommend getting too into it as there is not much of a community for feedback now. However, if you would still like to learn, I would recommend reading this crash course on lua: http://luatut.com/crash_course.html. It is by no means an in-depth tutorial but it should give you enough information to start 'messing around' with lua. I recommend starting with a simple Hello World program followed up by a 'Push the Button' style game (where you simply press a button and something happens). If you have any questions, feel free to ask.